1401573666509 has 2 divisors, whose sum is σ = 1401573666510. Its totient is φ = 1401573666508.

The previous prime is 1401573666497. The next prime is 1401573666541. The reversal of 1401573666509 is 9056663751041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1390859346409 + 10714320100 = 1179347^2 + 103510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1401573666509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1401573666589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700786833254 + 700786833255.

It is an arithmetic number, because the mean of its divisors is an integer number (700786833255).

Almost surely, 2^{1401573666509} is an apocalyptic number.

It is an amenable number.

1401573666509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1401573666509 is an equidigital number, since it uses as much as digits as its factorization.

1401573666509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4082400, while the sum is 53.

The spelling of 1401573666509 in words is "one trillion, four hundred one billion, five hundred seventy-three million, six hundred sixty-six thousand, five hundred nine".